50.0 mL of a HCl solution was diluted to 350 mL to give a final concentration of 0.80 mL, what was the initial concentration?

Aseasonal prevailing wind in the region of south and southeast asia, blowing from the southwest between may and september and bringing rain (the wet monsoon ), or from the northeast between october and april (the dry monsoon ).

Reducing agents  oxidized by the reaction 

Ithink b not to sure hope that : )